| 摘要 |
FIELD: transport.SUBSTANCE: proposed mechanism comprises drum 32 fitted on shaft 30 and is driven by motor to wind up lifting cable 28. Besides, lifting mechanism incorporates switch to stop motor at decreased tension of lifting cable. Said switch is connected with drum and has rod 52 to thrust against lifting cable to vary its path. Lifting cable retains said switch in first position unless cable tension exceeds threshold value. Note here that motor runs in normal conditions. In case lifting cable tension drops below threshold value (for example, in cable rupture), switch displaces in second position to switch off the motor. Said switch displaces from first position into second position in turning about swivel pin 54. Note here that said turn proceeds at gravity of said switch at release of potential power accumulated therein Vertical sliding door incorporates above described mechanism.EFFECT: higher safety.10 cl, 3 dwg |
